Shared context
Shared context is the working knowledge (decisions, conventions, and background) that every AI tool and teammate can read from one place, instead of each keeping its own isolated copy.
In detail
Without shared context, each AI tool and each person holds a partial, private view of a project. Shared context unifies that into one layer every session can read from and write to, so a decision made in one tool or by one teammate is available everywhere. It is the difference between a team of disconnected sessions and one shared brain.